CN112713822B - High-frequency modulation motor position detection device - Google Patents
High-frequency modulation motor position detection device Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
- H02P6/183—Circuit arrangements for detecting position without separate position detecting elements using an injected high frequency signal
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2203/00—Indexing scheme relating to controlling arrangements characterised by the means for detecting the position of the rotor
- H02P2203/03—Determination of the rotor position, e.g. initial rotor position, during standstill or low speed operation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2203/00—Indexing scheme relating to controlling arrangements characterised by the means for detecting the position of the rotor
- H02P2203/11—Determination or estimation of the rotor position or other motor parameters based on the analysis of high frequency signals
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- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The invention relates to a high-frequency modulation motor position detection device, which at least comprises a high-frequency excitation circuit, a sensing element and a demodulation and calculation circuit, wherein the high-frequency excitation circuit realizes the narrow-band alternating voltage excitation of a specific carrier frequency of the sensing element; the sensing element at least comprises a transmitting coil and a receiving coil which are fixedly connected with a motor stator and a feedback coil which is fixedly connected with a motor rotor, wherein the transmitting coil, the feedback coil and the receiving coil work in a resonance state under the action of narrowband alternating voltage excitation of a specific carrier frequency; the demodulation and demodulation circuit detects the resonance voltage signal of the receiving coil to realize demodulation of the motor position signal. Compared with the prior art, the invention fully utilizes the technical characteristics of high-frequency modulation, and has the advantages of small switching loss of the high-frequency excitation circuit, large load impedance range in the optimal working state, good frequency selectivity of the sensing element, strong anti-interference performance, high-frequency processing speed of a demodulation calculation part, good noise resistance and the like.
Description
Technical Field
The invention belongs to the technical field of position detection and measurement, relates to a motor position detection device, and particularly relates to a high-frequency modulation motor position detection device which can also be used for other non-contact type position detection.
Background
The acquisition of rotor position information plays a vital role in a motor control system, and the sensing accuracy directly influences the efficiency, the actual torque and the highest rotating speed of motor control.
In current motor position detection, the resolver is one of the most important forms, as shown in fig. 1. Taking a common reluctance type rotary transformer as an example, a primary exciting winding and a plurality of secondary detecting windings (two sine and cosine windings are generally arranged) are generally arranged, and the magnetic conductance between the exciting winding and the detecting windings changes along with the change of a motor rotor, so that the mutual inductance between the exciting winding and the detecting windings is changed. In this way, as the rotor rotates, the amplitude of the induced electromotive force on the secondary side changes periodically, and the rotor position information can be obtained through analysis and extraction in the follow-up process.
Such rotary transformers have the following difficulties and disadvantages:
1) An iron core is used as a magnetizing medium to control reasonable transformation ratio, but the accuracy is more sensitive to flux guide uniformity, processing errors and installation accuracy;
2) The winding of the coil has non-uniformity;
3) The maximum carrier frequency is 20kHz, and the solution bandwidth limits the position dynamic response in a high-speed state;
therefore, a new motor position detection device needs to be explored.
"magnetic coupling resonant wireless power transfer" (Magnetically Coupled Resonant Wireless Power Transfer, MCR-WPT) is characterized by energy transfer between two subsystems having the same resonant frequency by magnetic field coupling. Wherein the transmitting coil and the receiving coil are respectively and electrically connected with the respective compensating circuits and work in a resonance state. The compensation circuit has various forms of series compensation, parallel compensation, series-parallel connection and the like according to practical application.
The invention patent application 201811150745.0 describes a method and a principle for detecting the rotor position by using MCR-WPT, and defines the structural design of windings in a sensing element, so that the non-contact power supply of the rotor is realized, and the mutual inductance has ideal alternating characteristics. However, the invention does not give out how to concretely realize the excitation circuit and the demodulation and calculation circuit, and the traditional position sensing excitation and detection circuit cannot be directly used, so that the scheme is incomplete and the efficiency of the detection principle cannot be fully exerted; meanwhile, the invention has the defect that the equivalent impedance of the sensing element is not constant and the output envelope signal is not ideal.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the high-frequency modulation motor position detection device which has the advantages of small switching loss, strong anti-interference performance and high-frequency processing speed.
The aim of the invention can be achieved by the following technical scheme:
a high-frequency modulation motor position detection device at least comprises a high-frequency excitation circuit, a sensing element and a demodulation and calculation circuit, wherein,
the high-frequency excitation circuit is provided with at least one high-frequency switching device, so that the narrow-band alternating voltage excitation of the specific carrier frequency of the sensing element is realized;
the sensing element at least comprises a transmitting coil and a receiving coil which are fixedly connected with a motor stator and a feedback coil which is fixedly connected with a motor rotor, wherein the transmitting coil is connected with a high-frequency excitation circuit, the transmitting coil, the feedback coil and the receiving coil work in a resonance state under the excitation action of the narrow-band alternating voltage with specific carrier frequency, and the mutual inductance between the feedback coil and the receiving coil is configured to be changed along with the position of the motor rotor, so that the (amplitude) modulation of a carrier excitation signal by a position signal is realized;
the demodulation and demodulation circuit comprises a demodulation part and an angle demodulation part which are connected, and detects the resonance voltage signal of the receiving coil to realize demodulation of the motor position signal.
The demodulation section employs a high frequency analog hardware circuit (also referred to as an analog front end, AFE).
The demodulation part at least comprises a coherent demodulation circuit or a peak detection circuit, and can detect resonance voltage signals of the transmitting coil and the receiving coil, and demodulation of motor (amplitude modulation) position signals is realized through a coherent demodulation principle or a peak detection principle.
The coherent demodulation circuit multiplies the in-phase resonance voltage signals of the transmitting coil and the receiving coil of the sensing element by a mixer or a multiplier, and then obtains demodulation signals by a low-pass filter. The peak detection circuit detects the resonance voltage signals of the transmitting coil and the receiving coil of the sensing element by using an adder and a diode detector to obtain a demodulation signal.
Further, the high-frequency excitation circuit is a class-E inverter. The class E inverter is preferably a sense element excitation circuit because of its inherent characteristics of zero voltage switching (Zero Voltage Switch, ZVS), low active element count, low drive loss, etc.
Preferably, the high-frequency excitation circuit is a class-E inverter independent of load, the output voltage waveform of the sensing element is kept relatively stable, and the class-E inverter driving signal is in phase with the equivalent load resonance voltage signal.
Further, the axes of the coils in the sensing element are coincident with the rotation axis of the motor rotor and are mainly coupled by an axial magnetic field.
Optionally, the transmitting coil is configured as a concentric circular winding, the receiving coil is configured as an axially equispaced multiphase winding, the feedback coil is configured as an axially equispaced winding, and the receiving coil and the feedback coil are the same in pole pair number.
Preferably, the receiving coil is configured as a three-phase Y-connection structure.
Further, each coil in the sensing element is connected in series with a compensation capacitor to form an LC resonance circuit. The sensing element does not contain a magnetic conductive iron core, takes air as a medium, is designed to have band-pass gain characteristics, does not need an additional iron core magnetic circuit, and is connected with a compensation capacitor so as to work at (nearby) a specific resonant frequency.
Optionally, each coil in the sensing element is made of a PCB circuit board.
Furthermore, the angle resolving part is a phase-locked loop-based resolving circuit and can be realized in a singlechip by software programming.
The phase-locked loop phase discrimination link calculates the difference between the actual position and the estimated position, the loop filtering link establishes the relation between the rotating speed and the position difference, the voltage-controlled oscillation link integrates the estimated rotating speed to obtain the estimated position, and the position detection of the high-frequency modulation motor is realized.
Optionally, the sensor element has a magnetic isolation element for shielding the magnetic field from external foreign objects. External foreign materials include, but are not limited to, ferromagnetic materials, permanent magnetic materials, etc. that generate eddy currents in a magnetic field. In particular, the magnetic shield element is composed of ferrite or the like.
Compared with the prior art, the invention has the following advantages:
1) Unlike available reluctance type rotary transformer, the exciting frequency is raised and the filtering bandwidth is raised during demodulation of output signal; the invention can realize high-gain signal output without iron core, and reduce processing cost and signal processing cost; the sensor element parameter design is more flexible, the design range of electrical parameters such as quality factors, coupling coefficients and the like is large, and the mechanical parameters such as stator and rotor spacing limit is reduced; the sensing element has good frequency selectivity and strong anti-interference performance.
2) The invention carries out targeted design on the excitation circuit and the detection circuit, solves the problems of inconstant equivalent impedance of the sensing element and nonideal output envelope signals, avoids the distortion of the sensor and improves the monitoring precision
3) The high-frequency excitation circuit adopts an E-type inverter, so that the switching loss is small, and the load impedance range in the optimal working state is large.
4) The demodulation and resolving circuit comprises a demodulation part and an angle resolving part which are connected, and has high-frequency processing speed and good noise resistance.
5) Compared with the published patent application 201811150745.0, the invention adopts the excitation, modulation and demodulation modes of a specific sensing element, overcomes and fully utilizes the characteristics of high-frequency modulation by introducing methods such as an E-type inverter, analog coherent demodulation and the like, fully utilizes and exerts the working characteristics of narrow band and high frequency of the sensing element, and carries out the coherent demodulation of a position signal by using a relatively mature analog circuit, so that the detection method is more perfect and practical.
6) Compared with the published patent application 201811150745.0, the invention adopts a specific high-frequency excitation realization circuit, can effectively improve measurement precision, reduce test errors, fully utilize the high-frequency carrier characteristics of a sensor, introduce an analog front-end circuit, and adopts the principles including but not limited to a multiplier, a mixer, a peak value envelope solution and the like to give out a specific realization circuit and algorithm of an knowing and calculating part, thereby avoiding the bottleneck problem of a special shaft angle conversion chip.
Drawings
FIG. 1 is a schematic diagram of a known "reluctance resolver";
FIG. 2 is a schematic diagram of the structure of the present invention;
FIG. 3 is an example of an implementation of a sensor coil according to the present invention;
FIG. 4 is a schematic diagram of a sensing element circuit (circuit equivalent);
FIG. 5 is a schematic diagram of a sensing element transmit coil excitation carrier voltage waveform and a receive coil circuit measurement capacitance voltage waveform;
FIG. 6 is a schematic diagram of a class E inverter circuit used in the present invention, wherein (6 a) is a schematic diagram of a class E inverter, and (6 b) is a phase contrast diagram of a switching tube driving signal and a parallel capacitor voltage signal;
FIG. 7 is a schematic diagram of an alternative load independent class E inverter of the present invention, wherein (7 a) is a schematic diagram of a "load independent class E inverter" and (7 b) is an impedance diagram of the class E inverter as seen from the switching tube;
FIG. 8 is a schematic diagram of the position detection device of the high-frequency modulation motor;
FIG. 9 is a flow chart of a coherent demodulation circuit based on a mixer or multiplier;
FIG. 10 is a schematic diagram of a Phase Locked Loop (PLL) based rotor position resolution algorithm;
FIG. 11 is a flowchart of peak detection in embodiment 2 of the present invention;
fig. 12 is an alternative circuit diagram example of embodiment 2 of the present invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
Example 1:
referring to fig. 2, the present embodiment relates to a high-frequency modulated motor position detection device, which includes a high-frequency excitation circuit 1, a sensing element 2, and a demodulation and calculation circuit, wherein the high-frequency excitation circuit 1 has at least one high-frequency switching device to realize narrowband alternating voltage excitation of a specific carrier frequency of the sensing element; the sensing element at least comprises a transmitting coil 7 and a receiving coil 9 which are fixedly connected with the motor stator 5 and a feedback coil 8 which is fixedly connected with the motor rotor 6, wherein the transmitting coil 7 is connected with the high-frequency excitation circuit 1, the transmitting coil 7, the feedback coil 8 and the receiving coil 9 work in a resonance state under the excitation of the narrow-band alternating voltage with specific carrier frequency, and the mutual inductance between the feedback coil and the receiving coil is configured to be changed along with the position of the motor rotor, so that the (amplitude) modulation of a carrier excitation signal by a position signal is realized; the demodulation and demodulation circuit comprises a demodulation part 3 and an angle demodulation part 4 which are connected, and detects the resonance voltage signal of the receiving coil 9 and the resonance voltage signal of the optional transmitting coil 7 to realize demodulation of the motor position signal.
The sensing element of the device is designed to be 4 pairs of poles and is mainly divided into a stator component and a rotor component, and the sensing element is manufactured based on a double-layer PCB. As shown in fig. 3, is designed as a structure of a transmitting winding, a feedback winding and a receiving winding. The transmitting coil 7 is designed in a circular shape located at the outermost side of the stator. The receiving coil 9 is designed as an irregular coil positioned on the inner side of the stator, and can be designed as a three-phase structure, wherein the included angle of each phase is 30 degrees, namely, the electric angle phase difference is 120 degrees. The rotor-side feedback coil 8 is designed as a fan shape, and the fan blade angle is 45 °. All coils are of multi-turn design to achieve a greater Q and higher output boost K. The winding coils are circumferentially and uniformly distributed, and the axis of the winding coils is parallel to the axis of the motor.
In this embodiment, the receiving coil eliminates the common mode signal by using a three-phase Y-type connection, and the winding structure with alternating positive and negative directions is not needed, so that the total impedance of the system is a constant value, which makes the current amplitude on the feedback winding constant in the resonance state, and avoids the distortion of the signal envelope of each phase winding.
The transmitting coil, the feedback coil and the receiving coil form an LC resonant circuit by utilizing series compensation capacitors, so that the transmitting coil, the feedback coil and the receiving coil work near the same resonant frequency, the specific frequency bandwidth is determined according to the quality factor design of the circuit, and the determination of the frequency bandwidth is directly related to the gain amplification factor of the sensing element. When the magnetic shielding material is applied in a complex environment, in order to avoid the interference of external foreign matters (metals, permanent magnets, other electromagnetic windings) and the like on the working magnetic field of the sensing element, a magnetic shielding material and a structure can be introduced, wherein the optional magnetic shielding material comprises ferrite and the like, and the specific structure of the magnetic shielding material is determined according to the optimization of the working environment.
The high-frequency excitation circuit provides narrow-band alternating excitation voltage with specific carrier frequency for two ends of the sensing element transmitting coil circuit, and the sensing element is based on air coupling and sufficient stator-rotor spacing, so that a space magnetic field generated by the rotor feedback coil can still generate a sinusoidal variation flux linkage in the receiving coil with an irregular shape, and the harmonic content is lower due to the structure that a plurality of turns of the receiving coil are uniformly distributed. In this sensor structure, the output capacitance voltage is modulated by the electrical angle change. The parameters are appropriately adjusted according to the variation characteristics of the electrical angle so that a high frequency signal in which the measured capacitance voltage has a sinusoidal envelope is output, as shown in fig. 5.
The sensing element transmitting coil of the high-frequency modulation motor position detection device needs to be supplied with alternating current with specific frequency, and the class-E inverter is preferably used as a high-frequency inversion excitation circuit of the sensing element. As shown in fig. 6a, the class E inverter is composed of a DC power supply DC and a choke coil L 0 A switching tube S (MOSFET), a parallel capacitor C 0 Series resonant network (i.e. sensing element transmitting coil resonance C 1 And L 1 ) Load Z s The constitution of the load Z in the exciting circuit of the embodiment s I.e. the equivalent resistance of the sensing element. Wherein L is 0 For choke inductance, stable DC current is provided, and capacitor C is connected in parallel 0 The capacitor comprises an external capacitor and a switch tube internal capacitor, C 0 And equivalent load Z s The size of the series resonant network C has important influence on the optimal working state of the E-class inverter circuit 1 And L 1 The function of (2) is to filter and ensure that the current at the output end is sine wave. Under the action of a driving signal PWM, the switching tube S is turned on and off at a specific frequency, so that the series resonant circuit is continuously charged and discharged to generate resonance, and the graph (6 b) is a PWM signal and a parallel capacitor C 0 Voltage V at two ends C0 Is a phase contrast plot of (2).
In another preferred embodiment, the high frequency excitation circuit may also employ a load independent class E inverter design approach. Sort the class E inverter load topology into the form as in fig. 7a, where the inverter output is connected to equivalent impedance Z s And L is 0 And C 0 Is designed to be 1.29 times the switching tube frequency f s To ensure ZVS operation.
To obtain a voltage waveform independent of loadResonant energy storage L 0 And C 0 Impedance +.>Must be the main component that determines the total impedance of the class E inverter. As shown in FIG. 7a, due to +.>And Z s The resistors which are connected in parallel and therefore have significantly smaller impedance values will determine the overall impedance and should therefore be +.>Less than |Z s | a. The invention relates to a method for producing a fibre-reinforced plastic composite. The class E inverter which is irrelevant to the load can keep ZVS working in a wide load impedance range, and the parallel capacitor voltage and the equivalent load voltage resonance signal are in the same phase, so that the coherent demodulation processing of the demodulation circuit in-phase signal is facilitated.
Fig. 8 shows an exemplary schematic diagram of the high frequency modulated motor position detecting apparatus of the present invention, which includes a sensing element, a high frequency excitation circuit, a demodulation section, and an angle resolving section. The PWM module in the digital signal processor (Digital Signal Processor, DSP) outputs high frequency signals to drive the switching tubes in the class E inverter using the gate driver, and additional power push-pull circuits are required to increase the driving capability of the gate output due to the insufficient maximum peak current of the gate drive pins. The class E inverter circuit provides a narrow-band alternating voltage signal for a transmitting coil at the stator side of the sensing element, after the sensing element signal is modulated, a carrier signal of the transmitting coil at the stator side and an envelope signal of the receiving coil enter a demodulation circuit, and after coherent demodulation is finished by using a mixer or a multiplier and a low-pass filter, signal bias processing is carried out. The obtained signal is subjected to envelope solving, and after being sampled by the ADC module, the signal is subjected to signal processing in the DSP to obtain the motor position by an algorithm.
In this embodiment, the demodulation section employs a coherent demodulation circuit. The schematic flow chart of the coherent demodulation circuit is shown in fig. 9, the three-phase measurement capacitor voltage of the receiving coil is multiplied by the carrier signal by a mixer or a multiplier respectively, and then the low-pass filtering is carried out by an RC first-order low-pass filter, so that a three-phase solution envelope signal containing the motor position is obtained. The high-frequency modulated three-phase envelope signals obtain three-phase demodulation signals through a hardware demodulation circuit, and the signal conditioning circuit performs amplitude modulation offset processing and then acquires data into the DSP through the ADC module.
The angle calculation part is shown in fig. 10, the angle tracking and calculation are completed in the DSP by using a phase-locked loop algorithm, and the principle of the digital phase-locked loop is applied to angle observation. The phase-locked loop is generally divided into three links, namely phase discrimination, loop filtering and voltage controlled oscillation. The phase discrimination link in the motor position calculation algorithm calculates the difference between the actual position and the estimated position, the loop filtering link establishes the relation between the rotating speed and the position difference through the PI controller, the voltage-controlled oscillation link integrates the estimated rotating speed to obtain the estimated position, a backward discrete digital integrator can be used for replacing the estimated position in specific implementation, and the phase lag caused by each filter can be compensated. Thereby realizing the detection of the position of the high-frequency modulation motor.
In a further preferred embodiment, the sensor element has a magnetic shielding element for shielding the magnetic field from external foreign bodies, in particular, the magnetic shielding element being composed of ferrite or the like.
Example 2:
for the sensor receiving signal demodulation circuit, another alternative scheme is to convert the bilateral modulation signal into unilateral modulation by using an operational amplifier, and obtain an envelope by using an envelope detection circuit, a gain adjustment circuit and a filter circuit, wherein the peak detection process is shown in fig. 11, and the circuit principle schematic diagram is shown in fig. 12. Building up an adder circuit using an operational amplifierAnd superposing the received signal and the carrier signal. Let one of the phase received signals be U x =acos θsin (2pi ft), carrier signal U y By matching resistors R1, R2, and R3 in fig. 12, the output signal is:
thus, a single-side modulated output signal can be obtained.
The envelope of the modulated signal is extracted by a diode peak detection circuit. Because the envelope line has positive bias, the signal gain is only required to be adjusted to a certain extent to meet the ADC sampling range, and the signal gain is sampled by the ADC module and then is operated in the DSP.
The position detection device can also be used in other non-contact position detection application fields, and is not limited to motor rotor position detection.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (8)
1. A high-frequency modulation motor position detection device is characterized by at least comprising a high-frequency excitation circuit, a sensing element and a demodulation and calculation circuit, wherein,
the high-frequency excitation circuit is provided with at least one high-frequency switching device for realizing the narrow-band alternating voltage excitation of the specific carrier frequency of the sensing element, and is an E-type inverter irrelevant to a load;
the sensing element at least comprises a transmitting coil, a receiving coil and a feedback coil, wherein the transmitting coil and the receiving coil are fixedly connected with a motor stator, the feedback coil is fixedly connected with a motor rotor, the transmitting coil, the feedback coil and the receiving coil work in a resonance state under the excitation action of the narrow-band alternating voltage with specific carrier frequency, the mutual inductance between the feedback coil and the receiving coil is configured to change along with the position of the motor rotor, the transmitting coil is a circular coil positioned at the outermost side of the stator, the receiving coil is an irregular coil positioned at the inner side of the stator, and the feedback coil is a fan-shaped coil;
the demodulation and demodulation circuit comprises a demodulation part and an angle resolving part which are connected, the resonance voltage signal of the receiving coil is detected, the demodulation of the motor position signal is realized, the demodulation part adopts a high-frequency analog hardware circuit, and is designed to at least comprise a coherent demodulation or peak detection analog circuit part, the resonance voltage signals of the transmitting coil and the receiving coil are detected, and the demodulation of the motor position signal is realized through a coherent demodulation principle or a peak detection principle.
2. The high-frequency modulated motor position detecting apparatus according to claim 1, wherein the axis of each coil in the sensor element coincides with the rotational axis of the motor rotor.
3. The high frequency modulated motor position detecting device of claim 1, wherein the transmitting coil is configured as concentric circular windings, the receiving coil is configured as axially equispaced polyphase windings, the feedback coil is configured as axially equispaced windings, and the receiving coil is identical to the feedback coil in pole pair number.
4. A high-frequency modulated motor position detecting apparatus according to claim 1 or 3, wherein the receiving coil is configured as a three-phase Y-type connection structure.
5. The high frequency modulated motor position detecting apparatus according to claim 1, wherein each coil in the sensing element is made of a PCB circuit board.
6. The high-frequency modulated motor position detecting apparatus according to claim 1, wherein the angle resolving section is a phase-locked loop-based resolving circuit.
7. The high frequency modulated motor position detecting apparatus of claim 6, wherein said solving circuit is replaced by a software algorithm.
8. The high-frequency modulated motor position detecting apparatus according to claim 1, wherein the sensor element has a magnetism blocking element.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3603098A1 (en) * | 1985-02-03 | 1987-01-08 | Svaetopluk Radakovic | A device having a number of receiving coils for avoiding a loss of reception due to the directional patterns of the transmitting and receiving coil in a signal transmission with magnetic field |
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Application publication date: 20210427 Assignee: Yiweike (Huzhou) New Energy Technology Development Co.,Ltd. Assignor: TONGJI University Contract record no.: X2024980004995 Denomination of invention: A High Frequency Modulation Motor Position Detection Device Granted publication date: 20231103 License type: Exclusive License Record date: 20240428 |